Good for you for wanting to take charge of your health before developing diabetes. Fruits that are lowest in sugar include berries (blueberries, blackberries, boysenberries), lemons, limes, and avocados (yes, avocado is a fruit!). Avoid fruit juices since they can be very high in sugar -- sometimes as much as soda! Without the fiber in the whole piece of fruit, fructose (the sugar in fruit juice) is processed quickly by our bodies and spikes blood sugar levels.
Focus on eating more vegetables, beans, and whole grains. These foods are high in fiber and help to slow down the release of sugars into our bodies. Choose lean meats and plain milk or yogurt for protein to help stabilize blood sugar as well.